1. Temperature is a measure of the average kinetic energy which is different from thermal energy which is the total energy.
2. Heat is the transfer of energy between two objects at different temperatures when thermal energy is the total energy of the particles.
3. A conductor is a substance that conducts thermal energy well when an insulator does not conduct thermal energy as well.
4. Both conduction and convection transfer thermal energy but conduction is by direct contact when convection happens because of the movement of a liquid or gas.
5. The states of matter are the physical forms in which substances can exist when a change of state is the conversion of one physical form to another.
December 18, 2007
Heat Lab
Purpose- Does volume affect the temperature?
Hypothesis- As we add more hot water to the cool water, the temperature of the two combined will increase.
IV- Hot water (mL)
DV- Temperature of hot and cold combined (mL)
Levels of IV-
No Hot Water
5 mL Hot Water
10 mL Hot Water
15 mL Hot Water
20 mL Hot Water
25 Hot Water
1 Trial
1 Trial
1 Trial
1 Trial
1 Trial
1 Trial
December 18, 2007
Salt and Ice Results
Solute
Amount of water melted (mL)
Observations (During experiment)
5g Salt
14
Salt is melting faster than sugar
5g Sugar
16
A little water at first. More water than salt at end.
5g Salt With 5g Sugar
18
Melts quickly
10g Salt
14
Melts quickly
10g Sugar
13
Melts quickly
10g Salt With 10g Sugar
19
Starts slow but melts quickly
No Solute
9
Melts slower than the others
Conclusion-
According to the data, when putting solutes in ice, it increases how much it melted. The range of the melted water goes from 28% to 36% with solutes. Without any solutes, the ice melts by 18%. When putting both solutes together, it made the ice melt a lot more than when the solutes were by themselves. When we did more amounts of one specific solute, it actually made less melted ice. This leads us to ask, “Why when you have 1 type of solute it makes less amount of water than when you have 2 solutes with the same amount.”
The hypothesis, when adding more solute increases the amount of melted ice, proved to be true.
When adding any type of solute, it changes the balance of the particles. When the solute and ice come into contact, the molecules of the ice turns into water. Melting is the change from a solid to a liquid, and this is what took place. Our results were very hard to understand so if we would do this again, we would do a few more trials per each amount of solute.
December 6, 2007
Salt and Ice Experiment
Purpose- To find out how much the ice will melt when adding different amounts of solute.
Independent Variable-Type and amount of solute.
Levels of Independent Variable-
5 g of salt
5 g of sugar
10 g of both salt and sugar
10 g of salt
10 g of sugar
20 g of both salt and sugar
1 trial
1 trial
1 trial
1 trial
1 trial
1 trial
Dependent Variable- The volume of melted water after 10 minutes.
Procedures-
1. Measure 5, 10, or 20 grams each of sugar or salt. Measure 50 grams of ice.
2. Combine sugar/salt/or both together into the beaker with 50 grams of ice.
3. For ten minutes, let the mixtures sit. Use a stopwatch to measure 10 minutes accurately.
4. Take the water each beaker collected from the melting ice and measure it using a graduated cylinder.
5. Record the results.
6. Repeat steps 1through 5 for each amounts of solutes.
November 8, 2007
Density of Air Lab
Today in class we did a lab to find out the mass and volume of air.
Mass Results
Mass of Empty Flask (g)
Mass of Flask with Air (g)
Air Alone (g)
110.6
110.8
.2
110.6
110.8
.2
110.6
110.9
.3
110.6
110.9
.3
Mean of Mass- .25
Volume Results**
Trials
Volume (cc)
1
264
2
266
3
265
4
263
Mean of Volume- 264.5
The density of air is .0009451
The actual density of air is .0012
Our Wiki Space
By Josh and Jessa
January 4, 2008
Here is our powerpoint of our lab that we made! Click on the link below.
January 3, 2008
Vocabulary
1. Temperature is a measure of the average kinetic energy which is different from thermal energy which is the total energy.
2. Heat is the transfer of energy between two objects at different temperatures when thermal energy is the total energy of the particles.
3. A conductor is a substance that conducts thermal energy well when an insulator does not conduct thermal energy as well.
4. Both conduction and convection transfer thermal energy but conduction is by direct contact when convection happens because of the movement of a liquid or gas.
5. The states of matter are the physical forms in which substances can exist when a change of state is the conversion of one physical form to another.
December 18, 2007
Heat Lab
Purpose- Does volume affect the temperature?
Hypothesis- As we add more hot water to the cool water, the temperature of the two combined will increase.
IV- Hot water (mL)
DV- Temperature of hot and cold combined (mL)
Levels of IV-
December 18, 2007
Salt and Ice Results
Conclusion-
According to the data, when putting solutes in ice, it increases how much it melted. The range of the melted water goes from 28% to 36% with solutes. Without any solutes, the ice melts by 18%. When putting both solutes together, it made the ice melt a lot more than when the solutes were by themselves. When we did more amounts of one specific solute, it actually made less melted ice. This leads us to ask, “Why when you have 1 type of solute it makes less amount of water than when you have 2 solutes with the same amount.”
The hypothesis, when adding more solute increases the amount of melted ice, proved to be true.
When adding any type of solute, it changes the balance of the particles. When the solute and ice come into contact, the molecules of the ice turns into water. Melting is the change from a solid to a liquid, and this is what took place. Our results were very hard to understand so if we would do this again, we would do a few more trials per each amount of solute.
December 6, 2007
Salt and Ice Experiment
Purpose- To find out how much the ice will melt when adding different amounts of solute.
Independent Variable-Type and amount of solute.
Levels of Independent Variable-
Procedures-
1. Measure 5, 10, or 20 grams each of sugar or salt. Measure 50 grams of ice.
2. Combine sugar/salt/or both together into the beaker with 50 grams of ice.
3. For ten minutes, let the mixtures sit. Use a stopwatch to measure 10 minutes accurately.
4. Take the water each beaker collected from the melting ice and measure it using a graduated cylinder.
5. Record the results.
6. Repeat steps 1through 5 for each amounts of solutes.
November 8, 2007
Density of Air Lab
Today in class we did a lab to find out the mass and volume of air.
Mass Results
Mean of Mass- .25
Volume Results**
Mean of Volume- 264.5
The density of air is .0009451
The actual density of air is .0012
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